Stephen, The center of a photograph is not any more exposed than the edges due to the left shutter. Lens design has a lot to do with the degree to which the non uniformity of exposure from edge to edge or corner to corner of a photograph is apparent. Something called the "cosine to the 4th power" is a factor at work. It has to do with the angle at which light rays arrive at the lens and the image surface ... and the distance they have to travel to get to the image plane. Some really wide angle cameras had a whirling fan installed in front of the lens to physically dodge the image forming rays allowing more to go to the edges than the center of the image. Others used a greyscale mask to try to accomplish the same thing. Some new lenses have included in their design a function that makes the aperture appear to get larger to light rays arriving at an angle than those that arrive more from directly in front of the lens. ... I think Andy Stephen Ylvisaker wrote:
When shooting using a camera with a leaf shutter, do any of you have a way to counteract the leaf shutter effect? I mean, it's certainly not what I would call vignetting, but it is very apparent the center of the picture is the brightest point. And, I know it could be taken care of in the "printing" process by burning the center down a little bit. But, is there an "in-camera" method to counteract the effect? Stephen greyfell@xxxxxxxxxxx "...decide...whether or not the goal is worth the risks involved. If it is, stop worrying....", and "Worry retards reaction and makes clear-cut decisions impossible." - Amelia Earhart, aviatrix.
